Reference

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ror

Built-in command

Arguments:

Description:

Compute the bitwise right rotation of selected images with specified value, image or mathematical expression, or compute the pointwise sequential bitwise right rotation of selected images.

Example of use:

$ gmic image.jpg ror 'round(3*x/w,0)' cut 0,255
Command: image.jpg ror 'round(3*x/w,0)' cut 0,255